57 lines
2.1 KiB
Plaintext
57 lines
2.1 KiB
Plaintext
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_check_sign.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_SIGN (TYPE, [ACTION-IF-SIGNED], [ACTION-IF-UNSIGNED], [INCLUDES])
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#
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# DESCRIPTION
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#
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# Checks whether TYPE is signed or not. If no INCLUDES are specified, the
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# default includes are used. If ACTION-IF-SIGNED is given, it is
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# additional shell code to execute when the type is signed. If
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# ACTION-IF-UNSIGNED is given, it is executed when the type is unsigned.
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#
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# This macro assumes that the type exists. Therefore the existence of the
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# type should be checked before calling this macro. For example:
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#
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# AC_CHECK_HEADERS([wchar.h])
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# AC_CHECK_TYPE([wchar_t],,[ AC_MSG_ERROR([Type wchar_t not found.]) ])
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# AX_CHECK_SIGN([wchar_t],
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# [ AC_DEFINE(WCHAR_T_SIGNED, 1, [Define if wchar_t is signed]) ],
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# [ AC_DEFINE(WCHAR_T_UNSIGNED, 1, [Define if wchar_t is unsigned]) ], [
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# #ifdef HAVE_WCHAR_H
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# #include <wchar.h>
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# #endif
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# ])
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#
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# LICENSE
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#
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# Copyright (c) 2008 Ville Laurikari <vl@iki.fi>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 10
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AU_ALIAS([VL_CHECK_SIGN], [AX_CHECK_SIGN])
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AC_DEFUN([AX_CHECK_SIGN], [
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typename=`echo $1 | sed "s/@<:@^a-zA-Z0-9_@:>@/_/g"`
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AC_CACHE_CHECK([whether $1 is signed], ax_cv_decl_${typename}_signed, [
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[$4]],
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[[ int foo @<:@ 1 - 2 * !((($1) -1) < 0) @:>@ ; (void)foo[0] ]])],
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[ eval "ax_cv_decl_${typename}_signed=\"yes\"" ],
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[ eval "ax_cv_decl_${typename}_signed=\"no\"" ])
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])
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symbolname=`echo $1 | sed "s/@<:@^a-zA-Z0-9_@:>@/_/g" | tr "a-z" "A-Z"`
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if eval "test \"\${ax_cv_decl_${typename}_signed}\" = \"yes\""; then
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$2
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elif eval "test \"\${ax_cv_decl_${typename}_signed}\" = \"no\""; then
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$3
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fi
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])dnl
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